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  1. #11
    Senior Member XexorZ's Avatar
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    Sounds like you're having a ball Keep it up!

    BTW keep in mind that UV damage is not always linear - (10X the UV may do more (or less!) than 10X the damage) depending on the ability of the material to dissipate the energy absorbed, re-radiate the absorbed photon at another frequency (fluorescence) and/or self repair (which is mostly just a DNA thing but some other materials can do this as well).

    There is a list of materiel here that exhibit a non-linear beta as well as some other info.

    "Messerschmidt!!"

  2. #12
    canoebie's Avatar
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    Quote Originally Posted by XexorZ View Post
    Sounds like you're having a ball Keep it up!

    BTW keep in mind that UV damage is not always linear - (10X the UV may do more (or less!) than 10X the damage) depending on the ability of the material to dissipate the energy absorbed, re-radiate the absorbed photon at another frequency (fluorescence) and/or self repair (which is mostly just a DNA thing but some other materials can do this as well).

    There is a list of materiel here that exhibit a non-linear beta as well as some other info.

    "Messerschmidt!!"
    What he said!!!
    Revolution is about the need to re-evolve political, economic and social justice and power back into the hands of the people, preferably through legislation and policies that make human sense. That's what revolution is about. Revolution is not about shootouts.

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  3. #13
    Brian's Avatar
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    Quote Originally Posted by XexorZ View Post
    Sounds like you're having a ball Keep it up!

    BTW keep in mind that UV damage is not always linear - (10X the UV may do more (or less!) than 10X the damage) depending on the ability of the material to dissipate the energy absorbed, re-radiate the absorbed photon at another frequency (fluorescence) and/or self repair (which is mostly just a DNA thing but some other materials can do this as well).

    There is a list of materiel here that exhibit a non-linear beta as well as some other info.

    "Messerschmidt!!"
    Thanks for the info and concern - we're mainly trying to establish an overall trend and relationship to UV exposure and tensile/impact strength and pressure head up to 2000mm. Hopefully, we'll be able to compare the different fabrics and the lab analog to some of the 'real-world' exposed specimen's I've gotten from a few HF users, both under the tensile tester as well as in the electron microscope to look at fiber integrity. That's the plan for this semester, and if we don't get it done for this class I'll definitely be spending some of my own time and money getting into the SEM to take a look.

    We're concerned/excited about some of the possible crosslinking activity under the UV tester, although there seems to be some literature out there proving that we're not completely biasing the test with high exposure for accelerating our aging process. There are also a few artificial weathering machines that focus on high intensity UVB radiation for the UV component - we're simply imitating that portion of the process and ignoring the physical wear and tear.

    And for the record, I get 6.72-7.03 hours of sleep per 86.4 kilosecond period. The sad part is that I didn't have to do that last math out...I knew that already
    Brian MacMillin
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  4. #14
    Senior Member Cannibal's Avatar
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    Quote Originally Posted by Brian View Post
    And for the record, I get 6.72-7.03 hours of sleep per 86.4 kilosecond period. The sad part is that I didn't have to do that last math out...I knew that already
    There are a great many things wrong with you my friend.
    But, you make a darn fine tarp...all is forgiven.
    Trust nobody!

  5. #15
    in it for the naps oldgringo's Avatar
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    And here I was, thinking marriage to an English major was tough.

    Either one should be good for an automatic pass for heaven.
    Dave

    http://www.uark.edu/misc/xtimber/rna/pattonsbluff.html

    It has always been my private conviction that any man who pits his intelligence against a fish and loses has it coming.
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  6. #16
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    Good luck on the grad school applications. Even after I got laid off, I really didn't want to go back to school (although, the working engineering world has its issues too).
    Nice seeing you integrate your hobbies/interests into your studies. Materials was one of my favorite classes in undergrad.

    Will grab a tarp from you eventually though, so glad to know you'll still be producing them.

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